German Navy signalman from the Kriegsmarine are practicing flag signaling skills on the pier using a flag semaphore. Eastern Front, World War II in Europe.
German minesweepers type 1939 (Mod) moored to the pier in Nazi-occupied Riga, Latvian SSR.
Source: tsushima.su
Information source about the Nazi Navy signalman photo: seav.ru
Location: Riga, Latvia, USSR
Photo date: 1941